Use `"JAX"` mode by default when testing jax dispatching

tests/link/jax/test_basic.py

@@ -5,15 +5,13 @@ import numpy as np
 import pytest
 
 from pytensor.compile.function import function
-from pytensor.compile.mode import Mode
+from pytensor.compile.mode import get_mode
 from pytensor.compile.sharedvalue import SharedVariable, shared
 from pytensor.configdefaults import config
 from pytensor.graph.basic import Apply
 from pytensor.graph.fg import FunctionGraph
 from pytensor.graph.op import Op, get_test_value
-from pytensor.graph.rewriting.db import RewriteDatabaseQuery
 from pytensor.ifelse import ifelse
-from pytensor.link.jax import JAXLinker
 from pytensor.raise_op import assert_op
 from pytensor.tensor.type import dscalar, scalar, vector
 
@@ -27,12 +25,9 @@ def set_pytensor_flags():
 jax = pytest.importorskip("jax")
 
 
-jax_mode = Mode(
-    JAXLinker(), RewriteDatabaseQuery(include=["jax"], exclude=["cxx_only", "BlasOpt"])
-)
-py_mode = Mode(
-    "py", RewriteDatabaseQuery(include=[None], exclude=["cxx_only", "BlasOpt"])
-)
+# We assume that the JAX mode includes all the rewrites needed to transpile JAX graphs
+jax_mode = get_mode("JAX")
+py_mode = get_mode("FAST_COMPILE")
 
 
 def compare_jax_and_py(

tests/link/jax/test_subtensor.py

@@ -71,13 +71,15 @@ def test_jax_Subtensor_dynamic():
 
 def test_jax_Subtensor_boolean_mask():
     """JAX does not support resizing arrays with boolean masks."""
-    x_at = at.arange(-5, 5)
+    x_at = at.vector("x", dtype="float64")
     out_at = x_at[x_at < 0]
     assert isinstance(out_at.owner.op, at_subtensor.AdvancedSubtensor)
 
+    out_fg = FunctionGraph([x_at], [out_at])
+
+    x_at_test = np.arange(-5, 5)
     with pytest.raises(NotImplementedError, match="resizing arrays with boolean"):
-        out_fg = FunctionGraph([], [out_at])
-        compare_jax_and_py(out_fg, [])
+        compare_jax_and_py(out_fg, [x_at_test])
 
 
 def test_jax_Subtensor_boolean_mask_reexpressible():